MDS PREP
A case presenting with a gray coloured pseudomembrane whose removal is difficult and painful, can be
1) ANUG
2) Diphtheritic lesion
3) Secondary stage of syphilis
4) Desquamative gingivitis
Oral Pathology
Answer: 2
Diphtheritic lesions are caused by Corynebacterium diphtheriae. The hallmark of diphtheria is a tough gray pseudomembrane on mucosal surfaces like the pharynx or oral cavity. Attempting to remove it causes pain and bleeding. Other conditions like ANUG (acute necrotizing ulcerative gingivitis) produce pseudomembranes but are more localized and less gray.
An abnormal resorption pattern in primary teeth, delayed eruption of permanent teeth and a large tongue are the features of
1. Addison"s disease
2. Hypothyroidism
3. Hyperthyroidism
4. Von-Recklinghausen disease
Oral Pathology
Answer: 2
Hypothyroidism is characterized by abnormal resorption patterns in primary teeth and delayed eruption of permanent teeth.
Speed at which electron travel in gas tube once released from cathode filament is dependent on
1. Potential difference between electrodes
2. Angle between filament and anoxic target
3. Amount of kilovoltage applied to the circuit
4. Intensity of current applied to target
Oral Pathology
Answer: 1
The speed at which electrons travel in a gas tube is primarily dependent on the potential difference between electrodes.
Prolonged administration of broad spectrum antibiotics results in the formation of
1. Black hairy tongue
2. Decrease exposure time
3. Geographic tongue
4. Fissured tongue
Oral Pathology
Answer: 1
Prolonged administration of broad-spectrum antibiotics can lead to black hairy tongue.
Scleroderma involves
1. Tightening of oral mucosa and periodontal involvement
2. Multiple palmar keratosia
3. Raynaud"s phenomenon
4. All of the above
Oral Pathology
Answer: 4
Scleroderma involves tightening of oral mucosa, periodontal involvement, and Raynaud's phenomenon.
Which of the following is not characteristic of congenital syphilis?
1. Ghon complex
2. Interstitial keratitis
3. Mulberry molars
4. Notched incisors
Oral Pathology
Answer: 1
Ghon complex is associated with primary tuberculosis, not congenital syphilis. The other options (interstitial keratitis, mulberry molars, and notched incisors) are indeed characteristics of congenital syphilis.
Leukaemic gingivitis, because of spontaneous haemorrhage and necrosis, may be misdiagnosed as
1. Necrotising ulcerative gingivitis
2. Thrombocytopenic purpura
3. Infectious mononucleosis
4. Desquamative gingivitis
Oral Pathology
Answer: 1
Leukemic gingivitis may be misdiagnosed as necrotizing ulcerative gingivitis.
Thistle-tube appearance of pulp chamber is a feature of
1) Coronal dentin dysplasia
2) Regional odontodysplasia
3) Dentinogenesis imperfecta
4) Amelogenesis imperfecta
Oral Pathology
Answer: 1
Coronal dentin dysplasia is a genetic condition that affects the development of dentin, leading to abnormal pulp chamber morphology. The "thistle-tube" appearance refers to the shape of the pulp chamber, which resembles a thistle tube due to the constricted and elongated form of the pulp space. This condition is characterized by a normal crown appearance but with significant alterations in the pulp chamber and root canal system, making it distinct from other dental dysplasias.